Hello Everyone
I am new to Hibernate.
This is my first hibernate code where I am getting exception.
And I am unable to figure out what's going wrong.
Here is my code:
this is my Employee.hbm.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Employee" table="EMPLOYEE">
<id name="id" type="int" column="id">
<generator class="native"/>
</id>
<property name="firstname" column="first_name" type="String"/>
<property name="lastname" column="last_name" type="String"/>
<property name="salary" column="salary" type="int"/>
</class>
</hibernate-mapping>
hibernate.cfg.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="hibernate.connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="hibernate.connection.url">
jdbc:mysql://localhost/hibernatetest
</property>
<property name="hibernate.connection.username">
root
</property>
<property name="hibernate.connection.password">
root
</property>
<!-- List of XML mapping files -->
<mapping resource="Employee.hbm.xml"/>
</session-factory>
</hibernate-configuration>
My POJO
package com.practice.HBtest;
public class Employee {
private int id;
private
String firstName;
private String lastName;
private Integer salary;
public Employee(){}
public Employee(String fname,String lname , int salary){
this.firstName=fname;
this.lastName=lname;
this.salary=salary;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id=id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String first_name) {
this.firstName = first_name;
}
public String getLastName() {
return lastName;
}
public void setLastName(String last_name) {
this.lastName = last_name;
}
public int getSalary() {
return salary;
}
public void setSalary(int salary) {
this.salary = salary;
}
}
my main class:
package com.practice.HBtest;
import org.hibernate.HibernateException;
import org.hibernate.SessionFactory;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
public class EmployeeRecordManager {
private static SessionFactory sessionFactory;
private static ServiceRegistry serviceRegistry;
private Session session;
public static void main(String[] args) {
EmployeeRecordManager erm = new EmployeeRecordManager();
try {
Configuration cfg = new Configuration()
.addResource("Employee.hbm.xml");
SessionFactory sessionFactory = cfg.configure()
.buildSessionFactory(serviceRegistry);
} catch (Exception e) {
System.out.println(e);
}
Integer empID1 = erm.addEmployee("Amruta", "Ali", 1000);
Integer empID2 = erm.addEmployee("Ruchi", "Das", 5000);
Integer empID3 = erm.addEmployee("Mitul", "Paul", 10000);
System.out.println(erm);
}
public Integer addEmployee(String fname, String lname, int salary) {
Session session = sessionFactory.openSession();
Transaction tx = null;
Integer empID = null;
try {
tx = session.beginTransaction();
Employee employee = new Employee(fname, lname, salary);
empID = (Integer) session.save(employee);
tx.commit();
} catch (HibernateException e) {
if (tx != null)
tx.rollback();
e.printStackTrace();
} finally {
session.close();
}
return empID;
}
}
When i run it it throws me below exception:
Nov 7, 2012 2:55:05 PM org.hibernate.annotations.common.Version <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}
Nov 7, 2012 2:55:05 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.1.8.Final}
Nov 7, 2012 2:55:05 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Nov 7, 2012 2:55:05 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
Nov 7, 2012 2:55:05 PM org.hibernate.cfg.Configuration addResource
INFO: HHH000221: Reading mappings from resource: Employee.hbm.xml
Nov 7, 2012 2:55:05 PM org.hibernate.cfg.Configuration configure
INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
Nov 7, 2012 2:55:05 PM org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
Nov 7, 2012 2:55:05 PM org.hibernate.cfg.Configuration addResource
INFO: HHH000221: Reading mappings from resource: Employee.hbm.xml
Nov 7, 2012 2:55:05 PM org.hibernate.cfg.Configuration doConfigure
INFO: HHH000041: Configured SessionFactory: null
Nov 7, 2012 2:55:05 PM org.hibernate.cfg.Configuration$MappingsImpl addImport
INFO: HHH000071: Duplicate import: Employee -> Employee
org.hibernate.InvalidMappingException: Could not parse mapping document from resource Employee.hbm.xml
Exception in
thread "main" java.lang.NullPointerException
at com.practice.HBtest.EmployeeRecordManager.addEmployee(EmployeeRecordManager.java:38)
at com.practice.HBtest.EmployeeRecordManager.main(EmployeeRecordManager.java:29)
